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Post Retirement Benefits (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Pension, health and life insurance expense: |  |  |  |  |
Multi-employer plan contributions | $ 231,000 | $ 185,000 |  | $ 462,000 | $ 363,000
Defined contribution plan contributions | 324,000 | 286,000 |  | 586,000 | 545,000
Total pension expense | 555,000 | 471,000 |  | 1,048,000 | 908,000
Interest cost | 72,000 | 69,000 |  | 144,000 | 138,000
Amortization of prior service costs | (125,000) | (124,000) |  | (250,000) | (248,000)
Amortization of net loss | 29,000 | 43,000 |  | 58,000 | 86,000
Net periodic benefit cost | (24,000) | (12,000) |  | (48,000) | (24,000)
Total post retirement benefits expense | 531,000 | $ 459,000 |  | 1,000,000 | $ 884,000
Payments to pension plans |  |  |  | 699,000 |
Payments for post retirement healthcare and life insurance |  |  |  | 152,000 |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Accrued Expected Pension Plan Payments | $ 758,000 |  |  | $ 758,000 |
Scenario, Forecast [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Expected payments to pension plans |  |  | $ 1,286,000 |  |
Expected future payments for other post retirement benefits |  |  | $ 1,005,000 |  |

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